Psychic underground worker filled with sense of foreboding (4-6)
I believe the answer is:
mind-reader
'psychic' is the definition.
(someone with psychic powers)
'underground worker filled with sense of foreboding' is the wordplay.
'underground worker' becomes 'miner' (someone working underground in a mine).
'filled with' means one lot of letters goes inside another.
'sense of foreboding' becomes 'dread' (I've seen this in another clue).
'miner' enclosing 'dread' is 'MIND-READER'.
(Other definitions for mind-reader that I've seen before include "stage entertainer" , "One with psychic powers" , "one with special powers" , "Thought diviner" , "Telepathist" .)